JavaScript Data Structures

If you want to be able to look up a value by an index value (4, for example) , which data structure should you choose?

• array

• object

• set

• grid

What is an Object?

• An ordered list of objects

• An unordered list of objects

• A collection of (key, value) pairs

• elements listed in a grid form

We want to make a grocery list in our program. Which of the following is the correct way to make an array/list?

• var groceries = ["milk" "sugar" "eggs" "cake"];

• var groceries = ["milk, sugar, eggs, cake"];

• var groceries = "milk, sugar, eggs, cake";

• var groceries = ["milk", "sugar", "eggs", "cake"];

What method can we use to find the index of a particular element in an array?

• .index

• indexOf

• inIt

• findElement

The index of the very first item in an array is 1.

• true

• false

var numbers = [0, 1, 2, 3, 4];

How can we add a 6 to the end of numbers?

• pop(6)

• push(6)

• add(5,6)

• pop( )

What is a set?

• a collection of unique objects that are not in a specific order.

• a collection of ordered items.

• a collection of (key, value) pairs

• Elements in a row and column table

Which of the options below is a set?

• ["hello", "goodbye"]

• {"hello", "goodbye"}

• {"hello", "hello", "goodbye"}

• {

  Jeremy: "123-4567",

  Zach: "333-3333"

  }

What is a Grid?

• A collection of unique items with no particular order

• A collection of (key, value) pairs

• A collection of items each stored at a specific (row, column) location

• An unordered list with unique values

What is an array ?

• An unordered collection of items

• An ordered collection of items

• A collection of (key, value) pairs

• A collection of unique objects that are not in a specific order